A mineral group including actinolite, anthophyllite, arfvedsonite, cummingtonite, hornblende, richterite, glaucophane, grunerite, anthophyllite, riebeckite, tremolite, and others
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Category: <span>A</span>
The gradual and systematic reduction of a balance in an account over an assigned period
Rocks or minerals lacking crystal structure or form
A variety of translucent to transparent purple to grey coloured quartz common as a semiprecious gemstone. The color results from with ferric iron substitution for silicon
The surrounding or encompassing and current state of an area
The formation of usually fossilized amorphous hydrocarbons from ancient tree resins, having highly variable C:H:O ratios
A bright green or blue green variety of microcline sometimes cut as semi precious stones and for ornamental use
Alloys of mercury with one or more metal
An orthorhombic mineral 4[CaCO3]; having acicular, pyramidal, tabular, reniform, columnar, or stalactitic habits; a precipitant formed from hot carbonated water in springs, cavities in basalt, or biologically in shells and pearls (mother of pearl)
A trigonal mineral of the dolomite group, Ca(Fe,Mg,Mn)(CO3)2